![]() ![]() ![]() However, using the React Fragment syntax. Will result in the div being added to our dom. In comes the React.Fragment component to solve this issue – let's take a quick look at some examples! Before React Fragments Example 3 by SitePoint ( CodePen.You've probably experienced it before: you want to return multiple elements in a render() method so you're forced to wrap them in a or element which will go unused. This is where React Fragments can come into play, allowing you to more easily render groups of elements and avoid adding unnecessary extra tags, just like in the following example: When it comes to conditional rendering, React requires you to return a single element in both branches. React Fragments Example 2 by SitePoint ( CodePen. Since React Fragments support the key props, you can harness them to achieve so without introducing any extra markup. This can be achieved by mapping each array element to a corresponding HTML element, which is required by React to have a unique key. Your goal is to render all authors using the data in this array. Please note that this is not the case while using the short syntax.įor example, let’s say you have an array of objects where each element represents an author. React Fragment is a component exposed by React which serves as a parent component in JSX but doesn’t add anything to the DOM. ![]() React Fragments Example 1 by SitePoint ( CodePen.Īs stated in the React documentation, Fragments declared with the explicit syntax may have keys, and this is useful when dealing with any JavaScript collection. The Fragment component as stated earlier also accepts the key attribute for which we added a the product’s id as the value.With this, only the h2, p and span elements are added to the DOM. Let’s see them in action while defining a component returning four HTML elements. Vì vy v c bn chúng ta có th s dng React.Fragment thay th cho nhng ni chúng ta th div bao bc các phn t. In other words <> is quick and easy but you can’t add attributes to it, and React. React fragments cho phép bn nhóm các phn t vào vi nhau mà không cn phi b sung mt th nào bao bc chúng và nó cng s không th hin ra HTML. As seen before, this is the recommended approach, since using any other wrapper tag can lead to invalid HTML. While both React.Fragment vs <> let you group lists of components, the main difference between React.Fragment and <> is that the <> is simply a shorthand version of writing out React.Fragment that does not support attributes.Whenever you have to define a React component that needs to return multiple HTML elements, you should wrap them with the or tag. Wrapping multiple HTML elementsĪs you might have guessed, wrapping multiple HTML elements is the most common use case of React Fragments. There are three use cases where React Fragments are commonly used. On the contrary, see them as a way to avoid unnecessary tags and to get a better markup structure as a result. So, don’t think of Rect Fragments as a replacement for the s in your HTML. Think of this as a component that doesn’t translate to HTML. īasically, you should use React Fragments any time you would otherwise introduce an unnecessary wrapper to make your component return more than one HTML element. In the React release 16.2, a new feature was introduced called a React fragment. Click here to download the cheatsheet in PDF format. So, keep in mind that the empty tag is a shorthand for. Febru/ React The React Cheatsheet for 2022 Reed Barger Do you want to get up to speed with React as quickly as possible I’ve put together a super helpful cheatsheet to give you a complete overview of all of the React concepts you need to know in 2022. This leads to the same result as the example above. ![]() Here’s the code you might use for this: function Table ( ) Second, such an approach can lead to invalid HTML, as you’re going to see.įor example, let’s say you have a Table component which renders an HTML table, whose columns are rendered with another component called Columns. First, by using this approach consistently, you’re making your DOM more nested, and consequently slower to be rendered. From a logical point of view, this extra can usually be considered irrelevant, but it does have consequences. The easiest solution would be to use a wrapper. This is because React requires that components return only one HTML element. To achieve this, you must wrap all these elements with an HTML tag. As stated in the official React documentation, returning more than one HTML element is a commonly desired behavior for React components. ![]()
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